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Nebraska designated blue chalcendony (commonly called blue agate) as the official state gemstone in 1967. Blue chalcedony is a pale stone which sometimes has a dark internal form with bands of blue and white and often has a colorless streak. Blue agate is often used to make jewelry.
Blue agate is found in northwestern Nebraska, where it formed in wind-blown silt and claystone deposited in the Chadron Formation of the Oligocene Age.
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